In 1997, Halper co-founded ICAHD to challenge and resist the Israeli policy of demolishing Palestinian homes in the Occupied Territories and to organize Israelis, Palestinians and international volunteers to jointly rebuild demolished Palestinian homes as political acts of resistance (ICAHD has rebuilt 189 Palestinian homes).[1] Halper was nominated, together with the Palestinian intellectual and activist Ghassan Andoni, for the 2006 Nobel Peace Prize by the American Friends Service Committee for his work "to liberate both the Palestinian and the Israeli people from the yoke of structural violence" and "to build equality between their people by recognizing and celebrating their common humanity."

In 2013 Halper initiated, with a group of international activists, The People Yes! Network, intended to provide an "infrastructure" that will enable left and progressive groups to find each other across issues and geography, communicate, coordinate, share analyses and materials, and plan joint campaigns, especially around global issues. The ultimate goal of TPYN is to generate a conception of a just, inclusive, pluralistic and sustainable post-capitalist, "human-centric" (or "life-centric") world system and to help create the global movement that would bring it into being.

Halper co-founded the Israeli Committee Against House Demolitions (ICAHD) in 1997 to resist Israel's occupation and to work for a just peace between Israelis and Palestinians. ICAHD took as its vehicle of resistance the Israeli government's policy of demolishing Palestinian homes in the Occupied Territories (more than 47,000 since 1967, according to ICAHD),[7] only a little more than 1% being demolished for security reasons. Many of the homes are demolished as "collateral damage" in military operations (18,000 in the 2014 attack on Gaza alone), others because Israel uses discriminatory planning and zoning policies to restrict the granting of building permits, virtually freezing Palestinian building in 1967, demolishing them when Palestinian are forced to build "illegally." The objective for this, according to Halper, is not to ensure security for Israeli citizens but simply to confine residents in the West Bank and East Jerusalem to small, impoverished, and disconnected enclaves, leaving most of the land free for Israeli settlement and annexation.[8]

As ICAHD's Coordinating Director, Halper has organized and led direct action in opposition to Israeli policies. He has faced IDF bulldozers coming to demolish Palestinian homes,[1] and he organizes, in the framework of ICAHD, Palestinians, Israelis and internationals to rebuild demolished Palestinian homes.[9]

Typically, ICAHD will get a call from a Palestinian family informing it that bulldozers have arrived. ICAHD thereupon sends out an action alert, in response to which activists from different groups turn out and engage in civil disobedience by standing up to the bulldozers. ICAHD also raises funds to rebuild these homes in their original locations.[3] In addition, under Halper's leadership, ICAHD encourages dialogue between groups in an effort to open communication, foster reconciliation and challenge stereotypes. ICAHD works in coalition with a wide range of left-wing Israeli organizations including: Rabbis for Human Rights, the Alternative Information Center and Taayush, as well as Palestinian groups such as the Land Defense Committee, the Palestinian Agricultural Relief Committee (PARC) and Badil.[9]

"The Palestinian population in the Occupied Palestinian Territory, including occupied and illegally annexed East Jerusalem," according to the ICAHD, "continues to endure violence, displacement, dispossession and deprivation as a result of prolonged Israeli occupation, in most cases in violation of their rights under international law. In the West Bank, including East Jerusalem, demolitions are a major cause of the destruction of property, including residential and livelihood-related structures, and displacement."[10]

The organization describes Israel's demolition campaign as breaking into three stages. Stage 1, "Inside Israel" (1948-1960s), involved the destruction of Palestinian villages and urban neighborhoods " so that the refugees could not return and their lands could be turned over to the Jewish population." Stage 2,
"In the Occupied Territories" (since 1967), removed homes in the West Bank, East Jerusalem, and Gaza. And Stage 3, "Back Inside Israel" (1990s-present), involves demolition "at an ever accelerating rate."[11]

Halper has been arrested numerous times by Israeli authorities for protesting the demolition of Palestinian homes. "As Israelis, we are privileged," he said after one arrest. "They [the police] are not going to shoot us if we resist the demolition, but if a Palestinian had done it, they would have certainly shot him."[12]

"ICAHD staff and activists," explains the organization's website, "embark on extensive speaking tours abroad at the invitation of our international partners, participate in international conferences and gatherings, and appear frequently in the international media. Besides our work with our international partners, we meet with government officials and diplomats, both in Israel/Palestine and in their capitals, in an effort to affect their governments' policies." ICAHD says that the "overall objective" of its "intergovernmental organization work is to ensure that the protection and promotion of Palestinian rights and a just peace become an essential component of international relations in a consistent, principled and effective way." ICAHD has observer status in the UN and regularly interacts with the UN Human Rights Council, Special Rapporteurs, the High Commissioner for Human Rights and other international bodies.[13][14]

ICAHD offers a variety of "alternative" tours of Israel and Palestine, during which visitors can "meet Palestinian families suffering under Israeli policies of separation and home demolitions" as well as see "how Israel's settlement project has created irreversible ‘facts on the ground.'"

Halper has frequently appeared alongside Rev. Naim Ateek, the head of Sabeel, a Palestinian Liberation Theology group based in Jerusalem. "As a Jew and an Israeli," wrote Gerald M. Steinberg of the Jerusalem Center for Public Affairs, "Halper's appearances are seen as providing 'legitimacy' for Sabeel's extremist agenda, in the form of a counter to allegations of anti-Semitic motivations."[18]

Halper was arrested after sailing to Gaza in August 2008 with other peace activists from around the world.[20] He was the only Israeli on the ship.[21]

In March 2010, Halper was a keynote speaker at Israel Apartheid Week in Glasgow. Halper's lecture was entitled "Israeli Apartheid: The Case For BDS," during which he described the way that Palestinians are ‘warehoused' in Gaza.[22]

Halper supports the boycott, divestment, and sanctions movement, saying in a July 2013 article that BDS has "generated meaningful pressure on governments to justly resolve the Israeli–Palestinian conflict."[23]

In the same article he set forth five criteria for a just solution to the Israeli–Palestinian conflict:

A just peace and the process leading up to it must conform to human rights, international law and UN resolutions.

Regardless of whether there should or should not have been an Israel, two peoples now reside in Palestine-Israel and a just peace must be based on that bi-national reality.

A just peace requires an acceptance of the Palestinian refugees' right of return.

A just peace must be economically viable, with all the country's inhabitants enjoying equal access to the country's resources and economic institutions.

A just peace must be regional in scope – by itself Israel-Palestine is too small a unit to address all the issues at stake in the conflict—and it must address the security concerns of all in the region.[23]

Halper has often suggested that Israel is seeking to establish "facts on the ground," as he routinely puts it, that would render territorial concessions in any peace agreement inconceivable.[25] Halper takes a critical view of the Israeli-Palestinian peace process. He has stated that "during the process where you're supposed to be negotiating peace" Israel, in fact, "doubled its settlement enterprise".[26]

"The crime of apartheid," the ICAHD has said, "should be understood to mean inhumane acts committed in the context of an institutionalized regime of systematic oppression and domination by one racial group over any other racial group or groups and committed with the intention of maintaining that regime."

"The demolition of Palestinian homes and other structures, forced or resulting displacement, and land expropriation are politically and ethnically motivated," the ICAHD has declared. "The goal is to limit development and confine the four million Palestinian residents of the West Bank, East Jerusalem, and Gaza to small enclaves, thus effectively foreclosing any viable, contiguous Palestinian state and ensuring Israeli control and the 'Judaization' of the occupied West Bank and East Jerusalem." The ICAHD explains that "Judaization refers to the view that Israel has actively sought to transform the physical and demographic landscape to correspond with a vision of a united and fundamentally Jewish land under Israeli sovereignty in historic Palestine."[27]

Halper declared in April 2012 that "a two-state solution is no longer viable." For one thing, "the facts on the ground – the settlements, the wall, the highways and the fragmentation of the territory – are all just so massive and so permanent and are constantly being expanded that there's no more place for a coherent, functional, viable, sovereign Palestinian state." For another, "there's no political will in the international community to force Israel out of the Occupied Territories." He outlines "two possible one-state solutions," one of them being "a democratic state with one person, one vote," the other being "a bi-national one-state." He also proposes a further possibility: "the idea of a Middle Eastern Economic Confederation that looks something like the European Common Market of 30 years ago" and that would include "Israel/Palestine, Jordan, Syria and Lebanon."[28]

In September 2012, ICAHD endorsed a bi-national, one-state solution, and in April 2013 Halper explained that a two-state solution was only possible if Israel accepted Palestinian sovereignty over the Occupied Territories, Palestinian UN membership, the Palestinian right to national self-determination within the 1967 lines, and the integration of settlements on Palestinian land. He declared that "[t]here is a remarkable, mirror-like correspondence between Hamas and the right-wing in Israel, the latter ranging from the Likud through the religious settler movement."[29]

Halper was nominated, together with the Palestinian intellectual/activist Ghassan Andoni, for the Nobel Peace Prize by the American Friends Service Committee for his work "to liberate both the Palestinian and the Israeli people from the yoke of structural violence" and "to build equality between their people by recognizing and celebrating their common humanity."[17]